Experimental investigation of the scaphoid strain during wrist motion.
The scaphoid is the most frequently fractured of the carpal bones [Taleisnik, J., The Wrist, Churchill Livingstone, New York (1985)]. This project was undertaken to qualitatively evaluate the strain in the scaphoid during wrist motion using a newly developed strain gage method. Strain gage rosettes were mounted within the scaphoid and the range of motion of the hand was monitored using a custom designed electrogoniometer and data acquisition system. Ten specimens were utilized for this study. Results indicated that supination/pronation (S/P) of the forearm did not affect the strain in the scaphoid. A map of the strain in the waist of the scaphoid, as a function of flexion/extension (F/E) and radial/ulnar deviation (R/U), was generated. The contour plot of scaphoid strain vs range of motion (ROM) shows a valley where strains are low. Minimum scaphoid strain was found near neutral F/E and 15 degrees of ulnar deviation.
Romdhane
L
L
Department of Orthopaedics, College of Medicine, University of Florida, Gainesville 32610.
Chidgey
L
L
Miller
G
G
Dell
P
P
D000328:Adult; D001696:Biomechanical Phenomena; D002348:Carpal Bones / Q000502:physiology*; D005260:Female; D006801:Humans; D066298:In Vitro Techniques; D008297:Male; D008875:Middle Aged; D008991:Monitoring, Physiologic; D009068:Movement / Q000502:physiology*; D016059:Range of Motion, Articular / Q000502:physiology; D013314:Stress, Mechanical; D014955:Wrist Joint / Q000502:physiology*